Abstract
Coordinate relationship exists between pupillary near reflex, lens accommodation and eye movement in response to a target moving back and forth. An attempt has been made to clarify this coordinate relationship through the analysis of pupillary near reflex.
Static characteristics of pupillary near reflex were measured under various intensities of background illumination. When background illumination was dark and pupil size was large, changes in pupil size to accommodative stimulus were small. These results appear to, be in accordance with “range non-linearity” that was advocated by Stark et al.
It was also observed that a remarkable difference existed between dynamic characteristics of pupillary light reflex and those of pupillary near reflex. Pupil noise was suppressed during near reflex. Results of the measurements of static and dynamic characteristics in response to light and accommodative stimuli given simultaneously indicate that these two stimuli give an additive effect on pupil size.
A measurement system by which pupil diameter, lens power and eye movement were simultaneously and dynamically recorded was developed. The pupil and vergence responses are recorded by infrared-sensitive TV cameras. Changes in lens power are recorded by Campbell type optometer. The step and frequency responses to accommodative stimulus revealed that the speed of eye movement was the highest and that of pupil response was the lowest.
